Slice bar



y 1932- F. T. SPIKERMAN 1,861,195

SLIGE BAR Filed Nov. 5, 1950 I INVENTOR.

A TTORNEYJ,

Wan/t fJ w/rermau 9% awa FRenK r. SPIKER-MAN, or Arman, onIo, ASSIGNOR TO THE OSBORN MANUFACTURING Patented May 31, 1932 5 wa s- TA E PATENT; oFFicE COMPANLOI GLEVELAND, OHIO, A CORPORATION OFOHIO.

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Application filed November 5, 1 1 930 Serial 170. 493,534.

This invention relates to apparatus for conveying loosematerialand for dropping the same at'the end of the conveying stage in situations where it is necessary that the 6 discharge from the conveyor be uniform in quantity. Theparticular application of the device hereinshown'is in conjunction with an endless type of; conveyor. used for handling foundry sand, and the immediate purpose to be accomplished is to givea' uniform feed of 15 drop from'the1end-of the conveyor in such sand into the boot of an elevatoL-intoascreen, or apparatus of a generally similar nature. ,Such'sand is ;-usually moist enough to pack readily, which, gives it a tendency to large soft lumps." Particularly when feeding to shaking screens, eveningout the flow to avoid such lumps-increases the, screen capacity, the increaseat times amounting to 0 as much as, fifty per cent of the screen capacity. This invention is for the purpose ofgiving uniform discharge of the sand by breaking ;the large soft lumps so that the conveyor discharges the sand a fairly continuous, substantially uniform stream.-

A'secondaryaobject'of the inventionis the provisionof a device. of the sort described which will be rugged and certain in operation, relatively inexpensive, and which will permit the passageof solid pieces which may be carried along with the'sand, such as une broken lumps of hard bakedsand, gaggers, chaplets, and soon, inasmuch as it is'noob- 'ject of the present invention to provide for the breaking of lumps which. are hard enough to require a crusher or for separation out. of foreign elements.v

Although .Ihave illustrated in the accompanying drawings, and described below, mechanism which embodies a preferred form of my invention, it is to be understood that the invention is not limited to such mechanism, but that it may be embodied in other modes, all falling within the scope of the claims.

In the accompanying drawings Fig. 1 is a side elevation partly in section of the discharge end of the conveyor to which my invention has been applied; and Fig. 2 is a front view of the same.

My invention maybe applied to anyIsuitable type of continuous conveyor, suchas a fabric belt, link belt, or similar type, wherein a'substantially continuous pile of sand is moved forward and spilled. at the end where the conveyor turns down for itsreverse run. Such a conveyor is generally indicated'by thereference character 1 in Fig. 1 and is shown as comprising bottom elements 2 travelling alongtracks 3 upon wheels 4:. Side walls such as 5 may be provided to prevent the sand or other material from spilling out at the side. At the upperend a bull wheel 6 1 everses'the direction of the conveyor. as shown. The supporting frame 7 of the con veyor is extended upwardly as at 8 and forwardly asat 9 to receive a pair of arms 10 pivoted at 11. A broad flat U-shaped bar orblade having a horizontalportion 12 and legs 12 is suitably fastened between the for 7 ling surface of the conveyor 1. Suitable elements, counter weights 14 in the present embodiment, tend to hold the arms 10 in such a position that the bar 12, positioned across the conveyor and slightly above it about the point where the'downward turn starts. The rear end of the arms 10 are stopped in their upward movement by a cross bar 15, thus limiting the approach of the edge 13 to the conveyor surface by allowing the blade 12 to rise if an obstacle passes under it.

A chute 16 of any desired size may be provided to deliver the sand according to circumstances. I

The operation of this apparatus is as follows:

Sand will automatically be placed on the conveyor and carried up thereby "in a long continuous pile as indicated by reference character 20, Fig. 1. Since the sand is sufficiently moist toipack, its natural tendency isto drop off the end of the conveyor in fairly large coherent lumps. Although these. lumps will crumbleon striking the chute 16, they cause unevenflow of sand along the chute and deliver it to thescreen or other member, fed

by 16 in successlve piles rather than in a uniform stream. This is objectionable, as pointed out in the statement of invention.

By putting the blade 12 somewhat above the bottom of the conveyor but low enough down so that a considerable portion of the sand passes over it, as shown at 21, the lumps which tend to detach themselves from the stream of sand at the turn of the conveyor are broken up and fall in an outer almost continuous stream 22 of small lumps and the sand below the blade 12 is dropped in a thin stream indicated by the reference character 23, too thin for the coherent masses to be objectionably large. The upper part of the sand, 21, which is pushed over breaks ofli by itself and passes out and beyond the support 12 so that here again the lumps aresmall and closely spaced, the total result of both actions being that the sand falls almost in two continuous streams without any coherent masses in either too large to crumble and merge into a substantially uniform stream on the chute 16.

The use of the apparatus has shown that without the blade 12 the cohesion of the sand enables objectionably large masses to ride around the gradual turn at the end of the conveyor but only very small masses can be pushed past the discharge edge of the blade 12 without dropping olf.-

In the particular form of conveyor shown there are a series of shallow pockets formed by the shape of the bottom elements of the conveyor. Although these cause some slight irregularit of delivery which is not eliminated by t e bar 12, the volume of material handled by the conveyor is such that the relatively small irregularity so caused is of no consequence.

In case hard unbroken baked lumps of sand are carried along, as when sand cores get into the mold sand, or as may happen when the mold sand contains clay and the part adjacent a heavy casting has become baked, or if the sand contains pieces of metal, the resistance simply serves to lift the bar 12 until the edge 13 is far enough away from the conveyor to allow foreign bodies to pass under. As soon as they have passed the counter weight 14 restores the bar to its normal position, and the stops 15 prevent it from approaching the conveyor nearer than the proper setting. As stated above, the function of the blade 12 is simply to prevent the discharge of large lumpls due to the natural packing tendency of t e moist sand.

I do not limit myself to the embodiment of the invention which is described above and illustrated in the drawings, but set forth the scope of my invention in the appended claims.

What I claim is- 1. A continuous conveyor, means for di-. recting said conveyor downward at the discharge end, and a flat blade disposed across said conveyor at the discharge end, said blade elements on a downward curve at the being substantially horizontal in the longitudinal direction of the conveyor and substantially tangent to the beginning of said downward curvature, and being positioned somewhat above the conveyor bottom but within the path of the conveyor load.

2. In combination, an endless conveyor adapted to have loose material piled thereon, means for changin the direction of travel of said conveyor to ischarge material therefrom, and a broad flat bar adjacent said conveyor in the pathof part of said material at the point of change of direction adapted to support part of said material to be ushed over the rear edge of said bar by t e oncoming material.

3. In combination with a conve or having an upwardly directed flight an a downwardly directed discharge end, a horizontal blade disposed across said conveyor at the discharge end, said blade being mounted for a normal spaced position above said conveyor but in the path of the load carried thereby, means permitting increase of said space, and means tending to hold said blade in normal position.

4. In combination with a continuous conveyor for loose material means for directing said conveyor on a downward ath at the discharge end, a flat blade above t e conveyor bottom adjacent the be inning of said downward path but below t e top of the average load, and yieldable means for maintaining said blade in operative osition.

5. In combination wit a series of conveyor elements means for directing said conve or 13- charge end, a horizontal transverse bar spaced from said conveyor near the beginning of said curve but in the path of the average load and having its horizontal surface approximately tangent to said curve, and yield-,

able means for maintaining said bar in operative osition.

6. n combination with a conveyor of the continuous moving supplort type for loose material, said conveyor aving a downward turn at the discharge end, a bar disposed edgewise thereto substantially tangent to the turn of. the conveyor but above the conveyor bottom a distance less than the usual height of material conve ed.

Signed by me t is 31 day of October, 1930.

FRANK T. SPIKERMAN. 

